Physiological Characteristics of Capacity Constraints in Working Memory as Revealed by Functional MRI

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ID: 305113
1999
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Ranked #99 of 107 articles by views in cerebral cortex (new york, ny : 1991)

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Abstract
A fundamental characteristic of working memory is that its capacity to handle information is limited. While there have been many brain mapping studies of working memory, the physiological basis of its capacity limitation has not been explained. We identified characteristics of working memory capacity using functional magnetic resonance imaging (fMRI) in healthy subjects. Working memory capacity was studied using a parametric 'n-back' working memory task involving increasing cognitive load and ultimately decreasing task performance. Loci within dorsolateral prefrontal cortex (DLPFC) evinced exclusively an 'inverted-U' shaped neurophysiological response from lowest to highest load, consistent with a capacity-constrained response. Regions outside of DLPFC, in contrast, were more heterogeneous in response and often showed early plateau or continuously increasing responses, which did not reflect capacity constraints. However, sporadic loci, including in the premotor cortex, thalamus and superior parietal lobule, also demonstrated putative capacity-constrained responses, perhaps arising as an upstream effect of DLPFC limitations or as part of a broader network-wide capacity limitation. These results demonstrate that regionally specific nodes within the working memory network are capacity-constrained in the physiological domain, providing a missing link in current explorations of the capacity characteristics of working memory.
Reference Key
openalex_W2104527583 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Joseph H. Callicott
Journal cerebral cortex (new york, ny : 1991)
Year 1999
DOI
10.1093/cercor/9.1.20
URL
https://doi.org/10.1093/cercor/9.1.20
Keywords Keywords not found

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